The rational alcoholysis process of polyethylene terephthalate(PET)fibers was studied using ethylene glycol(EG)as alcoholysis reagent and zinc acetate(Zn(AC)2)as catalyst.The PET fibers with different aggregate structures were character-ized and the alcoholysis experiments were conducted.The alcoholysis process and products were characterized by differential scanning calorimetry,high-performance liquid chromatography-mass spectrometry and fully digital nuclear magnetic resonance spectroscopy.The results showed that the rational alcoholysis process of PET fibers was as followed:1.0%catalyst by mass frac-tion,stirring speed 300 r/min,reaction temperature 190℃,mass ratio of EG to PET fiber 9:1;the alcoholysis conversion rate of PET fibers decreased with the increase of the crystallinity,while the degree of orientation had little effect on the alcoholysis rate;the non alcoholysis products were mainly composed of unalcoholized PET fibers,trimers and dimers during the reaction process,and the alcoholysis product was dihydroxyethyl terephthalate without any other impurities.
关键词
聚对苯二甲酸乙二酯纤维/结晶度/取向度/聚集态结构/醇解
Key words
polyethylene terephthalate fiber/crystallinity/degree of orientation/aggregate structure/alcoholysis
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